| Mason to Orbetello | 4,704.80 mi (7,571.65 km) |
| Mason to Oria | 5,052.58 mi (8,131.34 km) |
| Mason to Oristano | 4,688.63 mi (7,545.62 km) |
| Mason to Orta Nova | 4,937.94 mi (7,946.85 km) |
| Mason to Orte | 4,753.45 mi (7,649.94 km) |
| Mason to Ortona | 4,841.91 mi (7,792.30 km) |
| Mason to Orvieto | 4,731.80 mi (7,615.09 km) |
| Mason to Orzinuovi | 4,539.78 mi (7,306.07 km) |
| Mason to Osimo | 4,758.87 mi (7,658.66 km) |
| Mason to Ospitaletto | 4,539.79 mi (7,306.09 km) |
| Mason to Ostuni | 5,040.64 mi (8,112.13 km) |
| Mason to Ottaviano | 4,905.86 mi (7,895.21 km) |
| Mason to Ovada | 4,514.36 mi (7,265.16 km) |
| Mason to Ozieri | 4,680.84 mi (7,533.08 km) |
| Mason to Paceco | 4,939.08 mi (7,948.69 km) |
